Sedimentary (Microcrystalline Silicate)

Jasper

Microcrystalline Quartz (SiO2)

Chert (Common Opal/Jasper transition)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Chert (Chert Nodule with Chalky Cortex)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Banded Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2)

Polished magnetite-rich rock, likely magnetite-bearing schist or ironstone

Magnetite (Fe₃O₄) in a foliated silicate matrix; exact identification requires testing

Chert (Flint) / Silicified Limestone

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Tumbled jasper (likely brown/yellow jasper)

Microcrystalline quartz, SiO₂, typically with iron-oxide and clay impurities

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Jasper

Microcrystalline Quartz (SiO2)

Chert Pebble (Water-worn Siliceous Pebble)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Mixed rock and mineral specimen collection

Varied silicate, carbonate, and oxide minerals; individual identification is not possible from this group photograph

Jasper and Ironstone (likely Jasperized Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Chert

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Chert (Agate)

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline Quartz (SiO2)

Chert / Flint Jasper

Microcrystalline Quartz (SiO2)

Flint

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (var. Jasper)

Microcrystalline Quartz (SiO2)

Weathered iron-rich rock, possibly ironstone or altered basalt

Indeterminate; likely ferruginous basalt/ironstone containing hematite-goethite and silicate minerals

Rounded porphyritic volcanic rock, likely andesite or rhyolite

Fine-grained silicate rock; likely plagioclase- and quartz/feldspar-bearing andesite–rhyolite

Tumbled brown chert or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chert/jasper

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Agate / Banded Chalcedony

Agate (Silicon Dioxide / SiO2)

Quartz (Smoky Quartz / Chalcedony)

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2)